.app{
    display: flex;
    flex-direction: column;
    .img{
        margin: 30% auto;
        margin-bottom: 0;
        border-radius: 50%;
        width: 300rpx;
        height: 300rpx;
    }
    .text{
        display: block;
        text-align: center;
        margin: 20rpx 0;
        color:gray;
    }
    .but{
        margin: 20rpx auto;
        border: 1px solid red;
        width: 300rpx;
    }
}